On April 22, more than one billion people every year celebrate Earth Day in more than 190 countries. According to the Earth Day Network, it is the largest civic observance in the world. Here are some interesting insights about Earth Day this year:

It’s going to be more important than ever because at last count 155 countries, including the U.S., have agreed to sign the Paris agreement on climate change during a special ceremony at the United Nations in New York.

This year’s celebration is a lead up to the 50th anniversary of Earth Day in 2020, and the Earth Day Network has pledged to plant 7.8 billion trees worldwide to account for every single person living on Earth.

Learn more about Earth Day by viewing Google’s latest Doodle with fascinating paintings and pictures from around the world.